The job market is now so tight that some firms are complaining they can’t hire as many workers as they want to — and indeed, official figures now show more empty jobs than jobless people seeking work. Despite this, pre-employment drug testing continues to be a hiring requirement for many workplaces.
https://www.vox.com/the-big-idea/2018/7/27/17619750/drug-testing-job-market-marijuana-opioids-cost-benefit